如何将apache poi添加到java中?

I am a beginner in java. I have downloaded a latest version of apache poi 3.16.
There are several jar files renamed and edited from old versions. i want to know how to set class path for the files in steps and what are all the jar files that need class path? I have imported all the jar files but it showed class not found exception in this code.

我是一个java初学者。我下载了最新版本的apache poi 3.16。有几个jar文件从旧版本重命名和编辑。我想知道如何为步骤中的文件设置类路径，需要类路径的jar文件有哪些?我已经导入了所有的jar文件，但是它显示了这个代码中的class not found exception。

import java.io.*;
import org.apache.poi.xssf.usermodel.*;
public class CreateWorkBook 
{
   public static void main(String[] args)throws Exception 
   {
      //Create Blank workbook
      XSSFWorkbook workbook = new XSSFWorkbook(); 
      //Create file system using specific name
      FileOutputStream out = new FileOutputStream(
      new File("createworkbook.xlsx"));
      //write operation workbook using file out object 
      workbook.write(out);
      out.close();
      System.out.println("
      createworkbook.xlsx written successfully");
   }
}

2 个解决方案

#1

Before setting the classpath for the jars create a lib folder with in your project folder and copy all the jar files in this folder. For example:

在为jar设置类路径之前，在项目文件夹中创建一个lib文件夹，并复制该文件夹中的所有jar文件。例如:

D:\Project\Java\lib

项目D:\ \ Java \ lib

After that include this location in your path.

然后在路径中包含这个位置。

For setting the path and classpath you can check this link:

要设置路径和类路径，可以检查这个链接:

https://docs.oracle.com/javase/tutorial/essential/environment/paths.html

https://docs.oracle.com/javase/tutorial/essential/environment/paths.html

For setting the path following steps:

Go to system properties

去系统属性

Click on advanced system settings

点击高级系统设置

Click on environment variables

点击环境变量

#2

If using Eclipse, follow https://*.com/a/3280384/3940047 for instructions. This library has other dependencies that need to be imported - ensure you've done that.

如果使用Eclipse，请按照https://*.com/a/32803384/3940047进行说明。这个库有其他需要导入的依赖项——确保您已经做到了这一点。

com.github.virtuald » curvesapi

com.github。virtuald»curvesapi

org.apache.poi » poi

表示。poi»poi

org.apache.poi » poi-ooxml-schemas

表示。poi»poi-ooxml-schemas

If using Maven, modify the pom.xml to include the poi-ooxml library. Transitive dependencies are taken care of by Maven.

如果使用Maven，请修改pom。包含poi-ooxml库的xml。传递依赖由Maven负责。

Please share exact exception trace and your environment details to help you further. I would not recommend to add the third party libraries to Java lib directory as it might add conflicts in future with other projects.

请分享准确的异常跟踪和您的环境细节，以进一步帮助您。我不建议将第三方库添加到Java lib目录中，因为它可能会在将来与其他项目发生冲突。